Compositions comprising apomorphine and organic acids and uses thereof

ABSTRACT

The present invention provides stable liquid or semi-solid pharmaceutical compositions of apomorphine, more particularly compositions comprising apomorphine and an organic acid, which are useful in treatment of neurological or movement diseases or disorders, e.g., Parkinson&#39;s disease, or conditions associated therewith.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No. 61/655,633 filed Jun. 5, 2012, the entire contents of which are herein incorporated by reference.

TECHNICAL FIELD

The present invention is generally directed to stable liquid or semi-solid pharmaceutical compositions of apomorphine, and uses thereof in treating neurological diseases or disorders, including Parkinson's disease, or conditions associated therewith.

BACKGROUND ART

Parkinson's disease is a progressive degenerative disease of the central nervous system. Although the primary cause of Parkinson's disease is not known, it is characterized by the degeneration of dopaminergic neurons of the substantia nigra. The substantia nigra is located in the midbrain and is involved in controlling voluntary movements. The degeneration of neurons causes a shortage of dopamine in the brain, which is believed to cause the observable symptoms of the disease. These symptoms include paucity of movement and rigidity, resting tremor, bradykinesia, and poor balance.

There are a variety of therapeutic treatments available for Parkinson's disease. The best known is levodopa, a dopamine precursor; however, treatment with levodopa can cause serious side-effects, especially over a long term. One such complication of long-term treatment with levodopa is the development of rapid fluctuations in clinical state, where a patient switches suddenly between mobility and immobility for periods ranging from a few minutes to a few hours. This phenomenon is known as the “on-off effect”, the “on” state characterized by the levodopa benefit of early normal motor functioning and the “off” state characterized by akinesia—abrupt loss of mobility, e.g, where a patient may suddenly stop while walking. Approximately half of patients on levodopa therapy will develop such on-off effects after several years of therapy.

While apomorphine hydrochloride has proved effective in treating “off” episodes in patients with Parkinson's disease a common and serious side effect of administering apomorphine hydrochloride by subcutaneous injection is the development of subcutaneous nodules at the injection site, which can become infected, necessitating treatment or surgical involvement. A majority of people on infused apomorphine develop nodules, and a new nodule may form every time the infusion needle is re-sited, which may happen on a daily basis. Such nodules may be painful, limit available infusion sites and interfere with absorption. Further, unstable compositions, e.g., having precipitate of apomorphine or other agents, may be the cause, or exacerbate, such nodule side effects. Thus, there is a need for new, stable formulations of apomorphine which are safe and effective for administration to patients.

SUMMARY OF INVENTION

This disclosure relates at least in part to the discovery that certain organic acids, e.g., acidic amino acids, form stable salts of apomorphine that are suitable for compositions allowing for subcutaneous administration without unwanted side effects.

In one aspect, the present invention thus relates to a stable liquid or semi-solid pharmaceutical composition, particularly an aqueous pharmaceutical composition, comprising apomorphine, an organic acid, e.g., an acidic amino acid, and a pharmaceutically acceptable carrier, wherein the molar ratio of apomorphine to the organic acid is about 1 to about 0.5-2.5, or about 1 to about 0.5-1.5, e.g., 1:1.2.

In another aspect, the present invention relates to a liquid or semi-solid pharmaceutical composition comprising (i) apomorphine or a salt thereof; and (ii) either an emulsifier or surfactant, or both emulsifier and surfactant, wherein the composition has substantially no precipitation of solids, for at least 48 hours at 25° C. within a pH ranging from about 3 to about 7.5, or at a pH greater than 4.

In a further aspect, the present invention provides a method of treating a neurological or movement disease or disorder, or a condition associated therewith, in a patient in need thereof, by administering a pharmaceutical composition as disclosed herein. In one embodiment, the method of the invention is aimed at treating a neurological disease or disorder characterized by reduced levels of dopamine in a patient's brain, e.g., Parkinson's disease, by administering the disclosed composition.

In one particular such aspect, the present invention thus provides a method of treating Parkinson's disease in a patient in need thereof by administering a composition as disclosed herein.

In another particular such aspect, the present invention provides a method of treating akinesia in a patient in need thereof, comprising administering to the patient a composition as disclosed herein, wherein the patient has been treated with levodopa.

In still another aspect, the present invention relates to a liquid or semi-solid pharmaceutical composition as defined above, for treatment of a neurological or movement disease or disorder, or a condition associated therewith.

In yet another aspect, the present invention relates to a liquid or semi-solid pharmaceutical composition as defined above, for use in treatment of a neurological or movement disease or disorder, or a condition associated therewith.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 shows the system used for evaluating the effect of apomorphine formulation composition on pig skin staining. Infusion pump set at 0.05 ml/h (A); Formulation delivered using a 22 G butterfly (B); Full thickness pig skin (cutis and subcutis) is placed on top of a bottle containing PBS. The skin is directly in contact with the PBS. The skin and bottle are covered with parafilm to protect the system from air as much as possible (C); A 100 ml bottle filled to the top with warm PBS (D); Formulation, 0.4 ml, was administered subcutaneously via a 22 G needle, at 0.05 ml/h (total of 8 h) (E); and Incubator set at 37° C. Samples were incubated for a period of about 17 h (F).

FIG. 2 shows the effect of the formulation composition on apomorphine-dependent skin staining following continuous subcutaneous infusion into full thickness pig skin of some of/be compositions exemplified in Example 3 hereinafter, wherein panel (a) shows 1% apomorphine-HCl (APO-GO®), pH 3.5; panel (b) shows 1% apomorphine-glutamate, pH 3.5; panel (c) shows 1% apomorphine-glutamate with ascorbic acid, pH 3.3; panel (d) shows 1% apomorphine-glutamate with ascorbic acid and meglumine, pH 4.2; panel (e) shows 1% apomorphine-glutamate with meglumine, pH 4.3; panel (f) shows 1% apomorphine-aspartate, pH 3.6; panel (g) shows 1% apomorphine-aspartate with meglumine pH 4.2; panel (h) shows 196 apomorphine-tartrate, pH 2.9; panel (i) shows 1% apomorphine-hemi tartrate, pH 3.2; and panel (j) shows 1% apomorphine-tartrate with meglumine, pH 3.6.

FIG. 3 shows histological grading of skin samples Grading of Subcutis (SC) Changes) 1, 2 or 3 weeks after subcutaneous administration of apomorphine solution containing 0.5% or 2.0% Tween-80.

DETAILED DESCRIPTION OF THE INVENTION Compositions

In one aspect, the present invention relates to a stable liquid or semi-solid pharmaceutical composition, particularly an aqueous pharmaceutical composition, comprising apomorphine and an organic acid. Exemplary organic acids include, without being limited to, amino acids, carboxylic acids, and dicarboxylic acids. For example, contemplated carboxylic acids and/or dicarboxylic acids for use in the claimed composition may contain at least two, three, or four carbon atoms, e.g., tartaric acid. Contemplated dicarboxylic acids for use in the claimed compositions may be hydrophilic or substituted with hydrophilic groups, e.g., hydroxyl groups.

In certain embodiments, the contemplated compositions may include apomorphine and an amino acid, e.g., a natural or unnatural amino acid. Contemplated amino acids for use in the claimed compositions may be, without limiting, acidic natural amino acids such as aspartic acid or glutamic acid, or acidic unnatural amino acids such as cysteic acid.

Contemplated herein, e.g., is a stable pharmaceutical composition comprising apomorphine and an organic acid, where the molar ratio of apomorphine to the organic acid is about 1 to about 0.5, or about 1.0 to about 2.5, or about 1 to about 0.5 to 1.5 (e.g., about 1:0.5 to about 1.0 to about 1.5). For example, in certain embodiments, the molar ratio of apomorphine to the organic acid is about 1:0.5, or about 1:0.6, or about 1:0.7, or about 1:0.8, or about 1:0.9, or about 1:1, or about 1:1.1, or about 1:1.2, or about 1:1.3, or about 1:1.4, or about 1:1.5, or about 1:1.6, or about 1:1.7, or about 1:18, or about 1:1.9, or about 1:2.0, or about 1:2.1, or about 1:2.2, or about 1:2.3, or about 1:2.4, or about 1:2.5.

In a particular embodiment, contemplated herein is a stable pharmaceutical composition comprising apomorphine and an amino acid, where the molar ratio of apomorphine to the amino acid is about 1 to about 0.5-2.5. For example, in certain embodiments, the molar ratio of apomorphine to the amino acid is about 1:0.5, or about 1:0.6, or about 1:0.7, or about 1:0.8, or about 1:0.9, or about 1:1, or about 1:1.1, or about 1:12, or about 1:1.3, or about 1:1.4, or about 1:1.5, or about 1:1.6, or about 1:1.7, or about 1:1.8, or about 1:1.9, or about 1:2.0, or about 1:2.1 or about 1:2.2, or about 1:2.3, or about 1:2.4, or about 1:2.5. In more particular embodiments, the amino acid is an acidic amino acid such as, without being limited to, aspartic acid, glutamic acid, or a combination thereof.

In certain embodiments, the pharmaceutical composition has a pH of about or greater than 3 at 25° C. In certain particular embodiments, the pharmaceutical composition has a pH between about 3.0 and about 5.5, more particularly between about 3.0 and about 5.0 at 25° C. In more particular embodiments, the composition has a pH between about 3.1 and about 4.9, about 3.2 and about 4.8, about 3.3 and about 4.7, about 3.4 and about 4.6, about 3.5 and about 4.5, about 3.6 and about 4.4, about 3.7 and about 4.3, about 3.8 and about 4.2, or about 3.9 and about 4.1 at 25° C. In other embodiments, the pH of the composition is about 4 at 25° C. In other particular embodiments, the pharmaceutical composition has a pH between about 4.0 and about 5.0, or between about 4.0 and about 7.5, at 25° C.

In certain embodiments, the pharmaceutical composition comprises at least about 1% by weight apomorphine. In some embodiments, the composition comprises about 1% to about 4% by weight apomorphine, e.g., about 1.25%, about 1.5%, about 1.75%, about 2%, about 2.25%, about 2.5%, about 2.75%, about 3%, about 3.25%, about 3.5%, about 3.75%, or about 4% by weight apomorphine. In other embodiments, a contemplated composition comprises about 1% to about 2.5% by weight apomorphine, or about 0.5% to about 3% by weight apomorphine, or about 1.1% to about 2.6% by weight or more apomorphine.

In certain embodiments, the pharmaceutical compositions of the present invention are stable for 24 hours, or for at least 24 hours, or more, at room temperature, e.g., at 20° C. to 30° C., e.g., at 25° C. For example, in some embodiments, the disclosed compositions are stable for 24 hours, for at least 48 hours, or for 7 days or more, at 25° C. In particular embodiments, the disclosed pharmaceutical compositions are stable for at least 48 hours at 25° C., or are even stable for longer periods at room temperature, for 3 days, 1 week, month, or longer.

In certain embodiments, the pharmaceutical composition has substantially no precipitation of solids for at least 24 hours, 48 hours, 7 days, or 2 months, e.g., at 20° C. to 30° C., e.g., at 25° C. In a particular embodiment, the pharmaceutical composition has substantially no precipitation of solids for at least 48 hours at, e.g., 20° C. to 30° C., e.g., at 25° C.

In certain embodiments, the pharmaceutical composition of the present invention further comprises an amino sugar, a basic amino acid, one or more antioxidants, or a combination thereof.

In certain particular embodiments, the pharmaceutical compositions of the invention further comprises an amino sugar such as, without being limited to, meglumine, and may also comprise a basic amino acid and one or more antioxidants. Particular such compositions comprise apomorphine, aspartic acid and/or glutamic acid, and meglumine.

In certain particular embodiments, the pharmaceutical compositions of the invention further comprises a basic amino acid such as, without limiting, arginine, and may also comprise an amino sugar and one or more antioxidants. Particular such compositions comprise apomorphine, aspartic acid and/or glutamic acid, and arginine.

In certain particular embodiments, the pharmaceutical compositions of the present invention further comprises at least one, i.e., one, two, three or more, antioxidant, i.e., an agent that inhibits the formation of oxidation products. Such an agent may be, e.g., tyrosinase inhibitors and/or o-quinone scavengers and/or Cu′ chelators and/or antioxidants, and/or tetrahydroquinolines. For example, contemplated formulations may include o-quinone scavengers such as, but not limited to, N-acetyl cysteine, glutathione, ascorbic acid. Na-ascorbate, and/or L-cysteine. For example, a contemplated formulation may include ascorbic acid and a cysteine, e.g., L-cysteine or N-acetyl cysteine. In a contemplated formulation, the ratio of ascorbic acid to another antioxidant, e.g., L-cysteine or N-acetyl cysteine, may exist at a particular weight-to-weight ratio such as about 1:1, about 2:1, about 3:1, about 4:1, about 5:1, about 6:1, about 7:1, about 8:1, about 9:1, or about 10:1. In some embodiments, formulations may include an agent chosen from one or more of tyrosinase inhibitors such as captopril, methimazole, quercetin, arbutin, aloesin, N-acetylglucoseamine, retinoic acid, α-tocopheryl ferulate, MAP (Mg ascorbyl phosphate), substrate analogues (e.g., sodium benzoate, 1-phenylalanine), Cu⁺⁺ chelators (for example. Na₂-EDTA, Na₂-EDTA-Ca), DMSA (succimer), DPA (D-penicillamine), trientine-HCl, dimercaprol, clioquinol, sodium thiosulfate, TETA, TEPA, curcurnin, neocuproine, tannin, and/or cuprizone. Other contemplated anti-oxidants that may form part of a disclosed formulation include sulfite salts, e.g., sodium hydrogen sulfite or sodium metabisulfite, di-tert-butyl methyl phenols, tert-butyl-methoxyphenols, polyphenols, tocopherols and/or ubiquinones, including but not limited to caffeic acid.

Contemplated antioxidants that can be included in disclosed compositions may be selected from, e.g., thiols such as aurothioglucose, dihydrolipoic acid, propylthiouracil, thioredoxin, utathione, cysteine, cystine, cystamine, and thiodipropionic acid; sulphoximines such as buthionine-sulphoximines, homo-cysteine-sulphoximine, buthionine-sulphones, and penta-, hexa- and heptathionine-sulphoximine; metal chelators such as α-hydroxy-fatty acids, palmitic acid, phytic acid, lactoferrin, citric acid, lactic acid, malic acid, humic acid, bile acid, bile extracts, bilirubin, biliverdin, EDTA, EGTA, and DTPA; sodium metabisulfite; vitamins such as vitamin E, vitamin C, ascorbyl palmitate, ascorbyl phosphate, and ascorbyl acetate; phenols such as butylhydroxytoluene, butylhydroxyanisole, ubiquinol, nordihydroguaiaretic acid, and trihydroxybutyrophenone; benzoates such as coniferyl benzoate; uric acid; mannose; propyl gallate; selenium such as selenium-methionine; stilbenes such as stilbene oxide and trans-stilbene oxide; and combinations thereof.

In particular embodiments, a contemplated pharmaceutical composition further comprises one or more antioxidants each independently selected from ascorbic acid, Na-ascorbate, L-cysteine, N-acetylcysteine (NAC), glutathione (GSH), Na₂-EDTA, Na₂-EDTA-Ca, or sodium bisulfite. In specific such embodiments, a contemplated pharmaceutical composition further comprises ascorbic acid and/or sodium bisulfite.

In certain embodiments, the pharmaceutical composition of the present invention further comprises a surfactant, i.e., a compound that lowers the surface tension of a liquid. Non-limiting examples of suitable surfactants include polysorbate surfactants such as Tween-80, Tween-60, Tween-40, Tween-20, Tween-65 and Tween-85, and sorbitane surfactants such as Span 20, Span 40, Span 60, Span 80 and Span 85. In a particular such embodiment, the pharmaceutical composition of the invention further comprises Tween-80.

In certain embodiments, the pharmaceutical composition of the present invention further comprises a local anesthetic, i.e., a drug which causes a reversible loss of sensation for a limited region of the body while maintaining consciousness, and/or an anti-inflammatory agent, Examples of local anesthetics include, without being limited to, amide based local anesthetics such as lidocaine, prilocaine, bupivicaine, levobupivacaine, ropivacaine, mepivacaine, dibucaine, and etidocine, and ester based local anesthetics such as procaine, amethocaine, cocaine, benzocaine, and tetracaine. Examples of anti-inflammatory agents include, without limiting, non-steroidal anti-inflammatory agents such as diclofenac, ketorolac, salicylates ibuprofen, piroxicam, and benzydamine, and steroidal anti-inflammatory agents such as prednisone, dexmethasone, betamethasone, prednisone hydrocortisone or salts thereof.

The pharmaceutical composition of the present invention may be liquid solutions, i.e., substantially homogeneous liquid mixtures at room temperature, e.g., at 25° C., or semi-solid solutions formulated, e.g., as a gel, gum, or candy. Such liquid or semi-solid mixtures may comprise water and/or other pharmaceutically acceptable carriers or excipients. In a particular embodiment, the disclosed composition is substantially aqueous.

In certain embodiments, a disclosed liquid or semi-solid formulation will be stable for a period of 1 day, 2 days, 3 days, 1 week, 1 month, or more at room temperature. In certain embodiments, the pharmaceutical composition as defined herein further comprises a pharmaceutically acceptable excipient such as, without being limited to, Tween-80, Tween-60, Tween-40, Tween-20, N-methylpyrrolidone (NMP), or polyvinylpyrrolidone (PVP), EDTA (or salts thereof), cysteine. N-acetylcysteine, and/or sodium bisulfite.

In certain embodiments, the compositions are stable lyophilized powders. The lyophilized powders can be reconstituted into a liquid formulation by addition of water alone or water and a pharmaceutically acceptable carrier, and may or may not include anti-oxidants.

In another aspect, the present invention relates to a stable liquid or semi-solid pharmaceutical composition, particularly an aqueous pharmaceutical composition, comprising (i) apomorphine or a salt thereof; and (i)) either an emulsifier or surfactant, or both emulsifier and surfactant. In one particular such aspect, the composition comprises apomorphine, and an emulsifier, surfactant, or both. In another particular such aspect, the composition comprises a salt of apomorphine, and an emulsifier, surfactant, or both. The apomorphine salt may be any salt formed by reacting apomorphine with an organic acid. Particular organic acids include, without limiting, amino acids, more particularly acidic amino acid such as aspartic acid, glutamic acid and cysteic acid, as well as carboxylic acids and dicarboxylic acids containing at least two, three, or four carbon atoms, e.g., tartaric acid. Particular such compositions have substantially no precipitation of solids, for at least 48 hours at 25° C. within a pH ranging from about 3 to about 7.5, or at a pH greater than 4. These compositions may be liquid solutions, i.e., substantially homogeneous liquid mixtures at room temperature. e.g., at 25° C., or semi-solid solutions formulated, e.g., as a gel, gum, or candy, and may comprise water and/or other pharmaceutically acceptable carriers or excipients. In particular embodiments, the disclosed compositions are substantially aqueous.

In certain embodiments, the pharmaceutical composition comprises at least 1% by weight apomorphine, or about 1% to about 4%, e.g., about 1.25%, about 1.5%, about 1.75%, about 2%, about 2.25%, about 2.5%, about 2.75%, about 3%, about 3.25%, about 3.5%, about 3.75%, or about 4%, by weight apomorphine.

In certain embodiments, the pharmaceutical composition disclosed comprises 0.01% to 4%, e.g., 0.01%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.2%, 2.4%, 2.6%, 2.8%, 3.0%, 3.2%, 3.4%, 3.6%, 3.8%, or 4.0%, emulsifier or surfactant.

In certain embodiments, the pharmaceutical composition defined hereinabove may further comprise one or more, i.e., one, two, three or more, antioxidants, as defined above. In particular embodiments, a contemplated pharmaceutical composition further comprises one or more antioxidants each independently selected from ascorbic acid, Na-ascorbate, L-cysteine, NAC, GSH, Na₂-EDTA, Na₂-EDTA-Ca, or sodium bisulfite.

In certain embodiments, a stable pharmaceutical composition of the present invention may be suitable for subcutaneous, intravenous, intranasal, transdermal, sublingual, intramuscular, buccal, ocular, or intratracheal administration. In some embodiments, the composition is continuously infused, e.g., subcutaneously via a small pump. In some embodiments, the composition is inhaled. In some embodiments, the composition is administered parenterally.

The disclosed compositions may be administered subcutaneously and/or e.g., substantially continuously. When administered subcutaneously and/or dermally, such compositions having apomorphine or a pharmaceutically acceptable salt thereof, and an organic acid, e.g., an acidic amino acid, may result in minimal local tissue damage, e.g., as compared to subcutaneous or dermal administration of a composition that includes apomorphine-HCl. Further, such apomorphine/organic acid compositions, when further including a basic amino acid such as arginine, and/or a basic amino sugar such as meglumine, and/or a surfactant such as Tween-80, may have more stability, e.g., may not precipitate and/or form unwanted oxidation products over time as compared to a composition having apomorphine-HCl. Further, such apomorphine/organic acid compositions, when further including a surfactant such as Tween-80 may have more stability, e.g., may not precipitate and/or form unwanted oxidation products over time as compared to a composition having apomorphine without a surfactant. As contemplated herein, subcutaneous administration may comprise the use of one or more infusion pumps and/or transdermal and/or dermal patches. Alternatively, a disclosed composition may be administered intraduodenally, intranasally, sublingually, intramuscularly, ocularly, buccally, intratracheally or intravenously.

As used herein in the specification, the term “organic acid” refers to an organic compound with acidic properties such as carboxylic acids, dicarboxylic acids, sulfonic acids, alcohols, hydroxy acids, thiols, and thio-acids. For example, the organic acids for use in the claimed composition may contain at least two, three or four carbon atoms, e.g., tartaric acid. Examples of organic acids include, but are not limited to, amino acids such as aspartic acid, glutamic acid, and arginine, and dicarboxylic acids such as fumaric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, maleic acid, and the like. Further examples of organic acids include lactic acid, malic acid, aconitic acid, citric acid, alycolic acid, ascorbic acid, formic acid, acetic acid, tartaric acid, and glucuronic acid.

The term “natural amino acid” refers to any of the amino acids found in proteins. Examples of natural amino acids include, but are not limited to, alanine, arginine, aspartic acid, glutamic acid, histidine, lysine, and the like.

The term “non-natural amino acid” refers to non-proteinogenic amino acids that either occur naturally or are chemically synthesized. Examples of non-natural amino acids include, but are not limited to, ornithine, β-alanine, 2-aminoadipic acid, 3-aminoadipic acid, γ-carboxyglutamic acid, hydroxylysine, 4-guanidinobutyric acid, 3-guanidinopropionic acid, 4-azidobutanoic acid, 5-azidopentanoic acid, and the like. Both D- and L-amino acids are contemplated herein.

The term “amino sugar” refers to a monosaccharide in which a non-glycosidic hydroxyl group is replaced by an amino or substituted amino group, such as meglumine, D-glucosamine, sialic acid, N-acetylglucosamine, galactosamine, and the like.

The term “anti-oxidant” refers to an agent that inhibits the formation of oxidation products.

The term “emulsifier”, also known as “emulgent”, refers to a substance that stabilizes an emulsion by increasing its kinetic stability, e.g., a “surface active substance” or a surfactant. The term “surfactant” refers to a surface active substance, i.e., a compound that lowers the surface tension of a liquid, the interfacial tension between two liquids, or that between a liquid and a solid.

The term “pharmaceutical composition” as used herein refers to a composition comprising at least one active agent as disclosed herein, formulated together with one or more pharmaceutically acceptable carriers.

The term “pharmaceutically acceptable carrier” or “pharmaceutically acceptable excipient” as used herein refers to any and all solvents, dispersion media, preservatives, antioxidants, coatings, isotonic and absorption delaying agents, surfactants, and the like, that are compatible with pharmaceutical administration. The use of such media and agents for pharmaceutically active substances is well known in the art. The compositions may contain other active compounds providing supplemental, additional, or enhanced therapeutic functions.

The terms “pharmaceutically acceptable” and “pharmacologically acceptable” include molecular entities and compositions that do not produce an adverse, allergic, or other untoward reactions when administered to an animal, or human, as appropriate. For human administration, preparations should meet sterility, pyrogenicity, general safety, and purity standards as required by a government drug regulatory agency, e.g., the United States Food and Drug Administration (FDA) Office of Biologics standards.

The term “physiologically acceptable pH” is understood to mean a pH of a composition that facilitates administration of the composition to the patient without significant adverse effects, e.g., a pH of about 3 to about 9.8 at 25° C., e.g., a pH of about 3.5±0.5 to about 9.5±0.3, or about 3.5 to about 9.5.

Methods

In a further aspect, the present invention provides a method of treating a neurological or movement disease or disorder, or a condition associated therewith, in a patient in need thereof, comprising administering to said patient a pharmaceutical composition as disclosed herein.

The neurological or movement diseases or disorders treated by the method of the present invention are characterized by reduced levels of dopamine in the brain, and include restless leg syndrome, Parkinson's disease, secondary parkinsonism, Alzheimer's disease, Huntington's disease, Shy-Drager syndrome, dystonia, akinesia, alcohol and morphine addiction, erectile dysfunction, and conditions resulting from brain injury, including carbon monoxide or manganese intoxication.

In one particular embodiment, the invention provides a method of treating Parkinson's disease in a patient in need thereof, comprising administering to the patient a pharmaceutical composition as disclosed herein.

In another particular embodiment, the invention provides a method of treating akinesia in a patient in need thereof, comprising administering to the patient a pharmaceutical composition as disclosed herein, wherein the patient has been treated with levodopa.

In a further embodiment, the invention provides a method of treating a condition associated with a neurological disease or disorder in a patient in need thereof, comprising administering to the patient a pharmaceutical composition as disclosed herein. The neurological disease or disorder contemplated herein is Parkinson's disease, Alzheimer's disease, or akinesia, and the conditions associated with a neurological disease or disorder include, without limiting, alcoholism, opiate addiction, and erectile dysfunction.

In still another aspect, the present invention relates to a liquid pharmaceutical composition as defined above for treatment of a neurological or movement disease or disorder as defined herein, or a condition associated therewith.

In yet another aspect, the present invention relates to a liquid pharmaceutical composition as defined above, for use in treatment of a neurological or movement disease or disorder as defined herein, or a condition associated therewith.

As used herein in the specification, the term “neurological disease or disorder” refers to a disease or disorder of the body's nervous system.

The term “movement disorder” refers to a nervous system condition that causes abnormal voluntary or involuntary movements, or slow, reduced movements.

The term “treated with levodopa” includes past or present treatment of a patient with levodopa.

Kits

A contemplated kit may include an apomorphine salt or a liquid composition having apomorphine and an organic acid (and optionally an additional therapeutic agent, levodopa, carbidopa, or entacapone). Such a composition may be liquid or a lyophilized powder that can be reconstituted into a liquid formulation, or, for example, may form part of a transdermal patch, and may be designed for administration by any suitable route such as, but not limited to, transdermally, intravenously, subcutaneously, intradermally, intramuscularly, or intraduodenally.

In some embodiments, disclosed liquid compositions, e.g., comprising apomorphine and an organic acid, may be provided in, e.g., one, two or more pre-filled cartridges suitable for use by a patient or physician. For example, provided herein is a kit comprising a prefilled cartridge wherein a disclosed liquid formulation is disposed within the cartridge (e.g., a pre-filled cartridge having a single dose or a dose suitable for a single administration to a patient of an apomorphine and organic acid formulation (and optionally an additional therapeutic agent, e.g., levodopa or carbidopa)), and optionally instructions for use.

The invention now being generally described, it will be more readily understood by reference to the following examples which are included merely for purposes of illustration of certain aspects and embodiments of the present invention, and are not intended to limit the invention in any way.

EXAMPLES Example 1 Preparation of Apomorphine Salt Solution/Formulation for Subcutaneous Administration

Sodium bicarbonate 0.1 N solution was added to a 1% apomorphine-HCl solution. The apomorphine-HCl solution was derived from APO-GO®, a commercially available product comprising a 10 mg/ml apomorphine-HCl solution. The precipitate, being the apomorphine base, was washed twice with water. The precipitated apomorphine base was dissolved with either a 0.59% glutamic acid solution, 0.53% aspartic acid solution, or 0.6% tartaric acid solution, to form a final 1% apomorphine solution at a 1:1 molar ratio with the glutamic, aspartic, or tartaric acid, or a 1:0.5 molar ratio with the tartaric acid. In some instances, ascorbic acid and/or meglumine solutions were added to the apomorphine salt solutions to obtain a final concentration of 0.5% or 0.6%, respectively. Table 1 shows the composition of apomorphine formulations which were prepared as described above.

TABLE 1 Composition of apomorphine formulations APO-GO ® 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 (10 mg/ml Apo.HCl) μl NaHCO₃ 310 310 310 310 310 310 310 310 310 (0.1N) prec. prec. prec. prec. prec. prec. prec. prec. prec. Glutamic acid 800 800 800 800 (5.9 mg/ml) μl Aspartic acid 800 800 (5.3 mg/ml) μl Tartaric acid 800 400 800 (6 mg/ml) μl Meglumine 100 50 50 50 + 50 (60 mg/ml) μl Ascorbic acid 100 100 5% μl Water μl 200 100 150 200 150 200 600 150 APO/Acid ratio 1 to 1 1 to 1 1 to 1 1 to 1 1 to 1 1 to 1 1 to 1 1 to 0.5 1 to 1 Solutions trans. trans. trans. trans. trans. trans. trans. trans. trans. trans. appearance pH 4.19 3.54 3.29 4.18 4.34 3.60 4.21 2.85 3.19 3.60 Total μl 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 prec. = precipitated; trans. = transparent

Example 2 Preparation of Apomorphine Salt Solution/Formulation for Subcutaneous Administration

Apomorphine-HCl hemi-hydrate was dissolved in 0.1% sodium bisulfite solution to form 1% apomorphine solution. Apomorphine was precipitated by adding the appropriate amount of 0.1N sodium bicarbonate solution. The precipitate was washed twice with water. The precipitated apomorphine base was dissolved with 1.47% glutamic acid solution to form a final 2.5% apomorphine solution at a 1:1 molar ratio with the glutamic acid. In some instances, ascorbic acid and/or meglumine and/or arginine solutions were added to the apomorphine-glutamate solution to obtain a final concentration of 0.5%, 0.6% or 0.56%, respectively. Table 2 shows the composition of apomorphine formulations which were prepared as described above.

TABLE 2 Composition of apomorphine formulations Formulation No. 1 2 APO•HCl (10 mg/ml) μl 1250 1250 NaHCO₃ 0.1N 412 412 precipitated precipitated Glutamic acid (14.7 mg/ml) μl 400 400 Meglumine (60 mg/ml) μl 50 L-arginine (56 mg/ml) Ascorbic acid 5% μl 50 Water μl 100 APO/Acid ratio 1to1 1to1 APO conc. (mg/ml) 25 25 Solutions appearance transparent transparent pH 3.60 4.13 Total μl 500 500

Example 3 Physical Stability of Apomorphine Salt Solutions In Vitro

Various apomorphine salt solutions were examined for stability after sitting at room temperature for a period of time. The results of the study are shown in Table 3. Notably, apomorphine salt solutions containing asparate, glutamate, tartrate, maleate and optionally meglumine were stable over the examined time range.

TABLE 3 Composition of apomorphine salt solutions for stability testing API Anti- Name Amount Acid name Other oxidant pH Color Precipitation Apomorphine- 1% HCl Examined Na- 3.5 Slightly Yes HCl after 50 hrs bisulfite greenish (Apo-Go ®) at RT, 8 hrs Apomorphine 1% Ascorbate at 40° C. Ascorbic 4.0 Greenish No Apomorphine 1% Ascorbate and 48 hrs at Ascorbic 3.3 Greenish No Apomorphine 1% Glutamate RT — 3.5 Colorless No Apomorphine 1% Aspartate — 3.1 Colorless No Apomorphine 1% Tartarate Examined — 2.5 Colorless No Apomorphine 2.5%   Maleate after 48 — 2.8 Colorless No Apomorphine 2.5%   Citrate hrs at RT — 2.4 Grayish No Apomorphine 2.5%   Succinate — 3.5 Colorless Yes Apomorphine 2.5%   Ascorbate Ascorbic 3.6 Greenish No Apomorphine 2.5%   Ascorbate Meglumine* Ascorbic 4.2 Greenish No Cysteine Apomorphine- 1% HCl * — 3.5 Slightly No HCl greenish (Apo-Go ®) Apomorphine 1% Glutamate * — 3.5 Colorless No Apomorphine 1% Glutamate * Ascorbic 3.3 Greenish No Apomorphine 1% Glutamate Meglumine Ascorbic 4.2 Grayish No Apomorphine 1% Glutamate Meglumine* — 4.3 Colorless No Apomorphine 1% Aspartate * — 3.6 Colorless No Apomorphine 1% Aspartate Meglumine — 4.2 Colorless No Apomorphine 1% Tartrate * — 2.9 Colorless No Apomorphine 1% Tartrate * — 3.2 Colorless No Apomorphine 1% Tartrate Meglumine* — 3.6 Colorless No *Examined after 48 hrs at room temperature (RT)

Example 4 Preparation of Apomorphine Salt Solution/Formulation for Subcutaneous Administration

Apomorphine-HCl hemi-hydrate was dissolved in 0.1% sodium bisulfite solution to form a 1% apomorphine solution. Apomorphine was precipitated by adding the appropriate amount of 0.1N sodium bicarbonate solution. The precipitate was washed twice with water. The precipitated apomorphine base was dissolved with 0.94% glutamic acid solution to form a final concentration of 1% or 1.5% apomorphine solution at 1:1 molar ratio with the glutamic acid. In some instances, ascorbic acid and/or meglumine and/or arginine solutions were added to the apomorphine-glutamate solution to obtain a final concentration of 0.5%, 0.6%, or 0.56%, respectively. Table 4 shows the composition of apomorphine formulations which were prepared as described above.

TABLE 4 Composition of apomorphine formulations Formulation No (%) 1 2 3 4 5 6 7 8 APO•HCl (10 mg/ml) μl 1000 1500 1000 1500 1000 1500 1000 1500 NaHCO₃ 0.1N 330 495 330 495 330 495 330 495 prec. prec. prec. prec. prec. prec. prec. prec. Glutamic acid 500 750 500 750 500 750 550 826 (9.4 mg/ml) μl Meglumine (60 mg/ml) μl 100 100 100 87 L-Arginine (56 mg/ml) 100 100 Ascorbic acid 5% μl 100 100 100 100 100 87 Water μl 500 250 300 50 300 50 250 APO Acid ratio 1 to 1 1 to 1 1 to 1 1 to 1 1 to 1 1 to 1 1 to 1.1 1 to 1.1 APO conc. (mg/ml) 10 15 10 15 10 15 10 15 Solutions appearance trans. trans. trans. trans. trans. trans. trans. trans. pH 3.83 3.76 4.40 4.27 4.46 4.32 4.41 4.20 Total μl 1000 1000 1000 1000 1000 1000 1000 1000 prec. = precipated: trans. = transparent

Example 5 Effect of Formulation Composition on Apomorphine-Dependent SC Staining Following Continuous Subcutaneous Infusion into Full Thickness Pig Skin, Ex Vivo

Various apomorphine-salt formulations were prepared and administered subcutaneously by continuous infusion into full thickness pig skin (cutis and subcutis) at a rate of 0.05 ml/h. FIG. 1 shows the system used for the procedure. During infusion, the apomorphine formulations were incubated at 37° C. for a period of 17 hours.

FIG. 2 shows the effect of the formulation composition on apomorphine-dependent skin staining following continuous subcutaneous infusion into full thickness pig skin of some of the compositions listed in Table 3, wherein panel (a) shows 1% apomorphine-HCl (APO-GO®), pH 3.5; panel (b) shows 1% apomorphine-glutamate, pH 3.5; panel (c) shows 1% apomorphine-glutamate with ascorbic acid, pH 3.3; panel (d) shows 1% apomorphine-glutamate with ascorbic acid and meglumine, pH 4.2; panel (e) shows 1% apomorphine-glutamate with meglumine, pH 4.3; panel (f) shows 1% apomorphine-aspartate, 3.6; panel (g) shows 1% apomorphine-aspartate with meglumine pH 4.2; panel (h) shows 1% apomorphine-tartrate, pH 2.9; panel (i) shows 1% apomorphine-hemi tartrate, pH 3.2; and panel (j) shows 1% apomorphine-tartrate with meglumine, pH 3.6. As shown in FIG. 2, the formulation containing 1% apomorphine-HCl (APO-GO®) caused the most severe staining of pig skin ex vivo. Notably, apomorphine salt formulations containing acidic amino acids (aspartate and glutamate) and optionally meglumine caused significantly less staining of pig skin than apomorphine-tartrate and HCl salts.

Example 6 Preparation of Glutamate, Aspartate and Tartrate Salts of Apomorphine

Apomorphine base preparation was performed in the following manner.

Apomorphine hydrochloride (Johnson Maltey, Macfarlan Smith) was dissolved in 0.1% Sodium metabisulfite solution (10 mg/ml). Sodium bicarbonate solution at 0.4M was slowly added to the solution with stirring. The mixture was then stirred for 30 minutes at room temperature. The white precipitate that formed was filtered under nitrogen, washed twice with sterile water and dried in a vacuum oven under dry nitrogen flow for 4 hours. The yield of apomorphine dry base was 75.5%.

Apomorphine salts were prepared by dissolving the apomorphine dry base in the appropriate acid solution at molar ratios ranging between 1:0.5 and 1:1.5.

Apomorphine glutamate solution was prepared by dissolving apomorphine base in 0.1M glutamic acid solution. Water was added to obtain solutions with a molar ratio of 1:1 or 1:1.2, apomorphine:glutamic acid, at a final concentration of 2% apomorphine. The pH of each solution was 4.7 and 4.4, respectively.

Apomorphine aspartate solution was prepared by dissolving apomorphine base in 0.1M aspartic acid solution. Water was added to obtain a molar ratio of 1:1, apomorphine:aspartic acid, at a final concentration of 2% apomorphine. The pH of the solution was 4.9.

Apomorphine tartrate solution was prepared by dissolving apomorphine base in 0.1M tartaric acid solution. Water was added to obtain solutions with a molar ratio of 1:1 or 1:0.5, apomorphine:tartaric acid, at a concentration of 2% apomorphine. The pH of each solution was 3.45 and 4.0, respectively.

Apomorphine malate solution was prepared by dissolving apomorphine base in 0.1M Malic acid solution. Water was added to obtain solutions with a molar ratio of 1:1 apomorphine:malic acid, at a concentration of 2% apomorphine. The pH of each solution was 4.0. Table 5 shows the composition of each apomorphine organic salt solution.

Example 7 Preparation of Apomorphine-Glutamate Formulations with Tween-80

Apomorphine-glutamate solutions were prepared in the following manner. Antioxidants were dissolved in water to obtain a 1% antioxidants solution. Tween-80 was dissolved in the antioxidants solution to obtain a final concentration of 4% Tween-80. The 4% Tween/antioxidants solution was further diluted in antioxidants solution to obtain the desired final concentration of Tween-80. Apomorphine base and glutamic acid were then weighed to obtain the desired molar ratio (e.g., 1:1 to 1:1.5). The prepared Tween-80/antioxidants solution was added and the solution was stirred until dissolution occurred.

TABLE 5 Composition of organic acid salts of apomorphine Formulation 2 3 6 7 No (%) 1 (1:1.2) (1:1.2) 4 5 (1 eq) (1/2 eq) 8 9 10 APO-GO (μl) 2500 APO base (mg) 50 50 50 25 50 50 50 50 25 Glutamic acid 1873 2250 2250 938 14.7 mg/ml (μl) Aspartic acid 1875 938 13.3 mg/ml (μl) Tartaric acid 1875 938 15 mg/ml (μl) Malic acid 1875 13.4 mg/ml (μl) Meglumine 125 188 60 mg/ml (μl) Water (μl) 627 250 125 1560 625 439 1562 625 1560 Total volume (μl) 2500 2500 2500 2500 2500 2500 2500 2500 2500 APO (mg/ml) 20 20 20 10 20 20 20 20 10 10 expected pH 4.68 4.40 4.76 4.69 4.93 3.45 3.98 3.98 4.59 3.90

Example 8 Comparison of Stability Between Apomorphine-Glutamate Solutions and Commercially Available Apomorphine-HCl Solutions

The stability of apomorphine-glutamate formulations containing 1% apomorphine, was compared to APO-GO®, a commercially available form of 10 mg/ml (1%) apomorphine-HCl solution. Comparisons were performed under physiological conditions approximated by diluting the solutions at 1:10 with phosphate-buffered saline solution, pH 7.5 (PBS). Table 6 shows the composition of the apomorphine-glutamate solutions—referred to as ND1 and ND2—which were synthesized for comparison to commercially available apomorphine-hydrochloride solution. Table 7 shows the stability of apomorphine in the apomorphine-hydrochloride and apomorphine-glutamate solutions as measured in milligrams of apomorphine per gram of solution at various time points following synthesis of the apomorphine-glutamate solutions. Table 8 shows the production of degradation products of apomorphine in the formulated solutions at various time points. Table 9 shows the stability of apomorphine in the apomorphine-hydrochloride and apomorphine-glutamate solutions as measured in milligrams of apomorphine per gram of solution at various time points following exposure to physiological conditions. Table 10 shows the production of degradation products of apomorphine in the solutions at various time points following exposure to physiological conditions. Degradation products in Tables 8 and 10 are shown as a percent of apomorphine peak area as measured by high-performance liquid chromatography (HPLC).

TABLE 6 Composition of apomorphine-glutamate formulations for stability analysis Ingredient (%) ND1 ND2 Apo base (FW 267.32) 1.0 1.0 Glutamic acid (FW 147.13) 0.8 0.8 Tween-80 0.5 2.0 Anti-oxidants 0.6 0.6

TABLE 7 Apomorphine stability (mg apomorphine/g solution) in spomorphine-glutamate and apomorphine-hydrochloride solutions at different time points Sample ID t = 0 hours t = 24 hours t = 6 days ND1 9.9 10.0 10.0 ND2 10.0 10.1 10.1 Apo-Go ® 11.8 ND ND ND = Not determined

TABLE 8 Degradation products of apomorphine produced in formulations as a percent of peak area (% of apomorphine peak area) Unknown r.t.: 5.5 min. Unknown r.t.: 6.9 min. Sample t = 0 t = 24 t = 6 t = 0 t = 24 t = 6 ID hours hours days hours hours days ND1 0.12 0.12 0.11 0.08 0.08 0.10 ND2 0.09 0.09 0.09 0.07 0.07 0.09 Apo- 0 ND ND 0.03 ND ND Go ® ND = Not determined

TABLE 9 Apomorphine stability (mg apomorphine/g solution) following exposure to physiological conditions (1:10 dilution in PBS)

ND = Not Applicable; Concentration of apomorphine in Apo-Go^(®) solution 6 days after exposure to physiological conditions is shown in gray.

TABLE 10 Degradation products of apomorphine produced under physiological conditions (1:10 dilution in PBS) as a percent of peak area (% of apomorphine peak area)

NA = Not Applicable; Concentration of apomorphine in Apo-Go^(®) solution 1 and 6 days after exposure to physiological conditions are shown in gray.

The results clearly demonstrated that under physiological conditions the glutamic acid salt of apomorphine was stable for at least 6 days at room temperature, whereas the commercial product APO-GO® was extensively degraded. Tween-80 at a concentration of 0.5% was sufficient to maintain chemical stability of apomorphine-glutamate solution, while even 2% Tween-80 was not sufficient to maintain chemical stability of Apomorphine-HCl (APO-GO®) solution.

Example 9 Analysis of Formulation Components on Apomorphine-Glutamate Solution Stability

The effect of Tween-80, antioxidants, and the molar ratio of glutamic acid to apomorphine on the physical stability of apomorphine-glutamate salt formulations under physiological conditions was tested by diluting the formulations at 1:10 or 1:20 with PBS. The composition of each of the tested formulations (F1-5) is shown in Table 11. Each component is shown as a percent of the total solution.

TABLE 11 Apomorphine glutamate salt formulations Ingredient (%) F1 F2 F3 F4 F5 Apomorphine 2.0 2.0 2.0 2.0 2.0 Glutamic acid 1.3 1.3 1.6 1.6 1.6 Tween-80 2.0 2.0 0 2.0 5.0 Antioxidants 0 0.6 0.6 0.6 0.6 Apo:Glut (molar ratio) 1:1.18 1:1.45

Samples of each formulation were diluted in freshly prepared PBS as shown in Tables 12 and 13. Samples of formulations F1-F3 were diluted in PBS at 1:20 (Table 11). Samples of formulations F4 and F5 were diluted in PBS at 1:10 and 1:20. The appearance of each solution was observed 20 minutes and 5 hours after dilution, and pH and Tween concentration were measured.

TABLE 12 Observations of formulations F1, F2 and F3 following 1:20 dilution Dilution 1:20 F1 F2 F3 20 minutes Micellar Transparent Precipitated  5 hours Blue/Precipitated Precipitated Precipitated pH measured 7.45 7.34 7.31 Tween-80 concentration 0.1 0.1 0 after dilution

TABLE 13 Observations of formulations F4 and F5 following 1:10 or 1:20 dilution Dilution 1:10 Dilution 1:20 F4 F5 F4 F5 2 hours Micellar Micellar Transparent Transparent 5 hours Micellar Micellar Micellar Micellar pH measured 7.09 7.07 7.34 7.32 Tween-80 concentration 0.1 0.25 0.1 0.25 after dilution

Following dilution of the formulations with PBS, the formulations were physically stable for at least 5 hours only if they contained Tween-80, antioxidants, and glutamic acid at a molar ratio of greater than 1:1.2, apomorphine:glutamic acid. In the absence of Tween-80 and at a molar ratio of 1:1.18, apomorphine:glutamic acid, the formulations were not physically stable at a pH of 7 to 7.5 (sec Tables 11 and 12, formulation F3). In the absence of antioxidants, the solution turned blue (see Tables 11 and 12, formulation F1).

Example 10 Analysis of Skin Inflammation Following Subcutaneous Administration of Apomorphine Formulations

Formulations containing 1% apomorphine and glutamic acid at a molar ratio of 1:1.5, were continuously administered subcutaneously to pigs, at a rate of 4 ml/24 h via a mini-pump. Commercially available 1% apomorphine-HCl (Apo-Go®) was also administered separately to allow for comparison of effects generated by administration of each agent. The formulation of each solution administered is shown in Table 14. Skin samples were collected 1, 2, or 3 weeks post-infusion and subjected to histopathological evaluation. Results are shown in Table 15. The sites that were infused with the apomorphine-glutamate formulations were characterized by minimal to mild chronic subcutaneous inflammation, whereas the commercial apomorphine-HCl preparation exhibited severe subcutaneous inflammation with necrosis (see the gray boxes in Table 15). There was no difference in the severity of lesions observed between the sites administered with formulations containing 0.5% or 2% Tween-80 as shown in FIG. 3.

TABLE 14 Formulations for Subcutaneous Administration Formulation 1 2 Apo-Go ® Ingredient Apo base 1.00 1.00 — (%) Apo-HCl — — 1.00 Glutamic acid 0.82 0.82 — Tween-80 0.50 2.00 — Antioxidants 0.6  0.6  0.1 

TABLE 15 Histological evaluation of skin exposed to apomorphine formulations

Grading at histological changes: 0 = No change, 1 = Minimal change, 2 = Mild change, 3 = Moderate change, 4 = Marked change

As shown in Tables 16, 17 and 18, HPLC analysis demonstrated that the stability of the tested formulations containing 0.5% or 2% Tween-80 (identified as NW and ND2) was similar between 4 and 6 days after preparation. The average apomorphine concentrations (AVG mg/g) are shown in gray in Tables 16 and 17.

TABLE 16 Analysis of apomorphine solutions 4 days post-formulation preparation

TABLE 17 Analysis of apomorphine solutions 5 days post-formulation preparation

TABLE 18 HPLC analysis of apomorphine solutions at 0 and 6 days post-formulation preparation Unknown r.t.: 5.5 min Unknown r.t.: 6.9 min Sample ID t = 0 t = 6 days t = 0 t = 6 days ND1 0.08 ND 0.08 ND ND1a 0.09 0.095 0.08 0.105 ND2 0.09 0.095 0.075 0.105 ND—Not Determined

Example 11 Effect of Tween-80 on Apomorphine Solution Stability

The effect of Tween-80 on the physical stability of apomorphine-HCl formulations and apomorphine-glutamate formulations was analyzed. All tested formulations contained proprietary combinations of antioxidants, Observations regarding the color of undiluted solutions and evidence of precipitation in those solutions were recorded after either 4 days or 1 week at 25° C. Additionally, observations regarding evidence of precipitation in diluted solutions were recorded after 4 days at 25° C. A 1:20 dilution of each solution was achieved by placing 2.85 ml of 50 mM PBS at pH 7.5 in a vial and adding 150 μl of each undiluted solution dropwise. The effect of Tween-80 on the stability of undiluted apomorphine-HCl formulations is shown in Table 19. The effect of Tween-80 on the stability of apomorphine-HCl formulations diluted 1:20 in PBS is shown in Table 20. The effect of Tween-80 on stability of apomorphine-glutamate formulations is shown in Table 21. The effect of Tween-80 on the stability of apomorphine-glutamate formulations diluted 1:20 in PBS is shown in Table 22.

TABLE 19 Effect of Tween-80 on stability of undiluted apomorphine-HCl formulations 1% Apomorphine-HCl, 2.5% Apomorphine-HCl, increasing Tween-80 from 0% to 0.5% increasing Tween-80 from 2% to 4% Ingredient F-1 F-2 F-3 F-4 F-5 F-6 Tween-80 (%) 0 0.25 0.50 2.00 3.00 4.00 Stability after No color No color No color No color No color No color 4 days at No No Precipitated Precipitated No No 25° C. precipitation precipitation precipitation precipitation Stability after No color No color No color No color No color No color 1 week at Very slight Precipitated Precipitated Precipitated Slight Very slight 25° C. precipitation precipitation precipitation

TABLE 20 Effect of Tween-80 on stability of diluted apomorphine-HCl formulations 1% Apomorphine-HCl, 2.5% Apomorphine-HCl, Increasing Tween-80 from 0% to 0.5% Increasing Tween-80 from 2% to 4% Ingredient F-1 F-2 F-3 F-4 F-5 F-6 Tween-80 (%) 0 0.25 0.50 2.00 3.00 4.00 Appearance Slight Micellar Micellar Not Micellar Not Micellar Not Micellar after 4 days precipitation Very turbid Very turbid Very turbid at 25° C.

TABLE 21 Effect of Tween-80 on stability of undiluted apomorphine-glutamate formulations 1% Aponiorphine-Glutamate, 2.5% Apomorphine-Glutamate, Increasing Tween-80 from 0% to 0.5% Increasing Tween-80 from 0% to 4% Ingredient F-7 F-8 F-9 F-10 F-11 F-12 F-13 Tween-80 0 0.25 0.50 0 2.00 3.00 4.00 (%) Stability No color No color No color Very slightly Very slighty Very slightly Very slightly after 4 days No No No yellow yellow yellow yellow at 25° C. precipitation precipitation precipitation No precipitation No precipitation No precipitation No precipitation Stability No color No color No color No color No color No color No color after 1 No No No No No No No week at precipitation precipitation precipitation precipitation precipitation precipitation precipitation 25° C.

TABLE 22 Effect of Tween-80 on stability of diluted apomorphine-glutamate formulations 1% Apomorphine-Glutamate, 2.5% Apomorphine-Glutamate, Increasing Tween-80 from 0% to 0.5% Increasing Tween-80 from 0% to 4% Ingredient F-7 F-8 F-9 F-10 F-11 F-12 F-13 Tween-80 (%) 0 0.25 0.50 0 2.00 3.00 4.00 Appearance Precipitated Almost Micellar Strongly Micellar Micellar Micellar after 4 days at transparent precipitated Turbid Turbid 25° C.

Precipitation occurred within 1 week at room temperature in all of the tested apomorphine-HCl formulations, whereas no precipitation occurred in any of the tested apomorphine-glutamate formulations. However, following dilution at 1:20 with PBS, both apomorphine salts precipitated in the absence of Tween (e.g., see formulations F-1, F-7, and F-10 in Tables 20 and 22). The 2.5% apomorphine-HCl solution could not be prepared without Tween as it did not dissolve.

Example 12 Comparison of Apomorphine-Glutamate and Apomorphine-HCl Formulation Stability

UV-HPLC was used to analyze and compare the chemical stabilities of the apomorphine-glutamate and apomorphine-HCl formulations. Table 23 summarizes apomorphine recovery after 1 month at 25° C. from apomorphine salt formulations that include varying amounts of Tween-80. The results documented in Table 23 show that the apomorphine-HCl formulation is less stable than the apomorphine-glutamate formulations of the instant invention.

TABLE 23 Apomorphine recovery from solution after 1 month at 25° C. Apomorphine Apomorphine Salt Tween-80 (%) recovery (%) 1% Apomorphine + Glutamic acid 0 99.0 1% Apomorphine + Glutamic acid 0.50 101.7 2.5% Apomorphine + Glutamic acid 0 94.6 2.5% Apomorphine + Glutamic acid 2.00 98.0 2.5% Apomorphine + Glutamic acid 3.00 98.3 2.5% Apomorphine + Glutamic acid 4.00 95.0 1% Apomorphine-HCl 0 89.3 1% Apomorphine-HCl 0 89.5

EQUIVALENTS

While specific embodiments of the subject invention have been discussed, the above specification is illustrative and not restrictive. Many variations of the invention will become apparent to those skilled in the art upon review of this specification. The full scope of the invention should be determined by reference to the claims, along with their full scope of equivalents, and the specification, along with such variations.

Unless otherwise indicated, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term “about”. Accordingly, unless indicated to the contrary, the numerical parameters set forth in this specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by the present invention.

INCORPORATION BY REFERENCE

The entire contents of all patent publications, websites, and other references cited herein are hereby expressly incorporated herein in their entireties by reference. 

1. An aqueous pharmaceutical composition comprising: apomorphine and glutamic acid wherein the molar ratio of apomorphine to the glutamic acid is about 1:1 to about 1:1.5, and a surfactant.
 2. The aqueous pharmaceutical composition of claim 1, wherein the molar ratio of apomorphine to glutamic acid is about 1:1.2.
 3. The aqueous pharmaceutical composition of claim 1, wherein the molar ratio of apomorphine to glutamic acid is about 1:1.3.
 4. The aqueous pharmaceutical composition of claim 1, comprising about 1% by weight apomorphine.
 5. The aqueous pharmaceutical composition of claim 1, comprising about 2.5% by weight apomorphine.
 6. The aqueous pharmaceutical composition of claim 2, comprising about 1 to about 2.5% by weight apomorphine.
 7. The aqueous pharmaceutical composition of claim 1, further comprising ascorbic acid and L-cysteine.
 8. The aqueous pharmaceutical composition of claim 7, wherein the weight-to-weight ratio of ascorbic acid to L-cysteine is about 4:1.
 9. The aqueous pharmaceutical composition of claim 7, wherein the weight o-weight ratio of ascorbic acid to L-cysteine is about 5:1.
 10. The aqueous pharmaceutical composition of claim 7, wherein the weight-to-weight ratio of ascorbic acid to L-cysteine is about 3:1.
 11. The aqueous pharmaceutical composition of claim 1, wherein the surfactant is polysorbate
 80. 12. The aqueous pharmaceutical composition of claim 10, comprising about 0.01% to 4% polysorbate
 80. 13. An aqueous pharmaceutical composition comprising: about 2.5% by weight apomorphine, glutamic acid, wherein the molar ratio of apomorphine to glutamic acid is about 1:1.2; ascorbic acid; L-cysteine; and a polysorbate surfactant.
 14. The aqueous pharmaceutical composition of claim 13, wherein the weight-to-weight ratio of ascorbic acid to L-cysteine is about 4:1.
 15. The aqueous pharmaceutical composition of claim 13, wherein the weight-to-weight ratio of ascorbic acid to L-cysteine is about 5:1.
 16. The aqueous pharmaceutical composition of claim 13, wherein the weight-to-weight ratio of ascorbic acid to L-cysteine is about 3:1.
 17. An aqueous pharmaceutical composition comprising: about 1% by weight apomorphine, glutamic acid, wherein the molar ratio of apomorphine to glutamic acid is about 1:1.2; ascorbic acid; L-cysteine; and polysorbate surfactant.
 18. The aqueous pharmaceutical composition of claim 17, wherein the weight-to-weight ratio of ascorbic acid to L-cysteine is about 4:1.
 19. The aqueous pharmaceutical composition of claim 17, wherein the weight-to-weight ratio of ascorbic acid to L-cysteine is about 5:1.
 20. The aqueous pharmaceutical composition of claim 17, wherein the weight-to-weight ratio of ascorbic acid to L-cysteine is about 3:1.
 21. The aqueous pharmaceutical composition of claim 1, wherein the composition has substantially no precipitation of solids for at least 48 hours at a pH of about 3.7 to about 4.3 at 25° C. 